Process of water purification



Patented Feb. 4, 1936 UNITED STATES:

{PATENT OFFICE raocnss oF'wAmn rmmcsnon Oliver M. Urbain, Columbus,Ohio, assi'gnor to Charles H. Lewis,

, Ohio No Drawing. Application July 28, 1934,

Serial N0. 737,475

' I .3Claims.(01.2102) This invention relates to an improvement inprocesses of water purification.

It has as its object: theprovision of a simple.

expedient process for eliminating or removing 5 carboxyiic acids fromwater in which they are in solution.

Specifically, the-process contemplates reacting with the carboxylicacids in solution a reagent which will form therewith addition compounds10' that are either unobjectionable or insoluble and R=ariv hyrocarbonradical, substituted or un-.

substituted-by any group or groups. X= one (1) or more.

The reagents that are employed in accordance 25 with the process of thisinvention to eifect elimination or removal of the carboxylic acids arethose reagents belonging to the group that I identify, as the "acidicamine salt type of reagents. a

Y 3 This group includes salts of amino acids. They may be the inner typesalts or the salts of the acid part of the molecule, or they may be thesalts of the amine part of the molecule, or they maybesaltsofboththeacidandaminepartsof 35 the 1 molecule. Examples are,

40 Om sodium snthmnilatc n rn innersaltoianthmnilicacid.

The reagents of the. acidic amine salt group" react with the carboxylicacids to form addition compounds. Examplary reactions are, as followsz H5 CIh-Gl-LOOOH-i- NZOH OHaCHaSOLNF propionic acida-amino-l-propanesnlionie acid sodium salt 0 H H OHaCHaCfi-O- IkOHLOHLSOLNa 3-amino-l-propanesulionic acid sodium salt oipropionicacid.I

These reactions take place at all pHs below pH 7.0. Should it benecessary to increase the pH of the reaction medium above pH 7.0 for anypurpose whatsoever after the above reaction has taken place, say withcalcium hydroxide, the end product of the above reaction will react withthe Ca(0H)z and the new end product will be, for. example, thefollowing:

3-amino-l-propanasulfonic acid calcium salt ofpropionic acid.

The process is carried out by first adjusting the pH of the solution tobring it belowpH '1 so though this is not an essential if for' otherreasons it is essential to operate at a higher pH.

The reagent is introduced tothe solution and the same agitated for abrief period. The product of the reactionwill of course vary dependingupon the pH of the'solution but in any instance 'it is removedor is ofan unobjectionable character.

The term inner salt as employed in the claims is intended to define asalt regarded as formed by 40 reaction within the molecule of a compoundhaving both acid and basic properties.

Having thus describedv my invention, what I claim is:'-

l. A process for eliminating carboxylic acids from water in which theyare in solution com prising reacting therewith a" reagent of the acidicamine salt group.

2. A process for eliminating carboxylic acids from water in which theyare in solution com- 0 prising reacting therewith an inner. salt of anamino acid. y

3. A process for eliminating carboxylic acids from water in which theyare in solution comprising reacting therewith the innersalt ofanthranilic acid.

OLIVER M. URBAIN.

